6. Intangible Assets

Our definite-lived intangible assets, other than capitalized software development costs, are summarized as follows, and reflects the acquisitions of Entrada, EagleDream and Inforth (see Note 4):

	September 30, 2018
	Customer			Software
	Relationships			Technology			Total
Gross carrying amount	$	54,450		$	94,310		$	148,760
Accumulated amortization		(37,819	)		(47,714	)		(85,533	)
Net intangible assets	$	16,631		$	46,596		$	63,227

	March 31, 2018
	Customer			Software
	Relationships			Technology			Total
Gross carrying amount	$	54,450		$	94,310		$	148,760
Accumulated amortization		(35,531	)		(39,138	)		(74,669	)
Net intangible assets	$	18,919		$	55,172		$	74,091

Amortization expense related to customer relationships and contracts recorded as operating expenses in the consolidated statements of comprehensive income was $1,121 and $2,012 for the three months ended September 30, 2018 and 2017, respectively. Amortization expense related to software technology recorded as cost of revenue was $4,288 and $3,807 for the three months ended September 30, 2018 and 2017, respectively.

Amortization expense related to customer relationships and contracts recorded as operating expenses in the consolidated statements of comprehensive income was $2,289 and $4,059 for the six months ended September 30, 2018 and 2017, respectively. Amortization expense related to software technology recorded as cost of revenue was $8,575 and $7,208 for the six months ended September 30, 2018 and 2017, respectively.

The following table summarizes the remaining estimated amortization of definite-lived intangible assets as of September 30, 2018:

	Estimated Remaining Amortization Expense
	Operating Expense		Cost of Revenue		Total
For the year ended March 31,
2019 (remaining six months)	$	2,056	$	8,576	$	10,632
2020		3,460		17,151		20,611
2021		2,803		13,268		16,071
2022		2,273		5,480		7,753
2023		1,866		1,761		3,627
2024 and beyond		4,173		360		4,533
Total	$	16,631	$	46,596	$	63,227